There is literally no difference between the UnrealCefSubprocess used in this plugin and the default web browser widget that comes with the engine (with the exception of GPU features being disabled by default). You can test the plugin with these features enabled using the -webgl parameter on the command line, except that will significantly degrade performance.
But I’m not going to sit here and figure out anything for webassembly or go through your project to get your custom framework working for you. Perhaps you should choose a more realistic and lightweight framework? As long as the browser works and the JavaScript executes (which it does) then we’ve already done our job. In fact, I heard about this little library called jQuery, it’s usually all I ever need to build a web interface…
So mark my words, any time I’ve been at a company using some stupid framework that uses databindings it usually goes absolutely nowhere, causes more headaches than it’s worth, and becomes obsolete in a few years. But hey if you need blazor or razor or tazer to make something of quality, go for it I guess. Good luck though.